Lathe-chuck.



J. G. OLIVER. LATHE CHUCK.

APPLICATION FILED JAN.14, 1909.

Patented July 6, 1909.

2 BKEBTB- -BHEET 1.

Wtnedmred. Dwenfori UNITED STATES PATENT OFFICE.-

JOHN G. OLIVER; 0F CLEVELAND, OHIO, ASSIGNOR TO BARDONS' AND OLIVER, OF

CLEVELAND, OHIO, A PARTNERSHIP.

LATHE-CHUCK.

Specification of Letters'Patent.

Patented July 6, 1909.

Application filed January 14, 1909. Serial No. 472,166. 7

To all whom it man concern:

Be it known that'I, JOHN G. QLIVER, a citizen of the United States, residing at Cleveland, in the county of uyahoga and State of Ohio, have. invented a certain new and useful Im roveinent in Lathe-Chucks, of which the fol owing is a full, clear, and exact description.

This invention relates particularly to means by which the chuck of the lathe may be caused to gras and release the work.

The object of t as invention is to provide novel and efficient means for this purpose, and for additionally cleaning the chips from the chuck jaws, and, in some cases, for removing the work from the chuck jaws.

The invention consists in the construction and combinations of parts hereinafter described and pointed out. definitely in the claims i In the drawing, Figure 1 is a front view of the part of a lathe embodying the invention.

Fig. 2 is a plan view of the same parts and Fig. 3 is a central vertical longitudinal section thereof.

Referring to the parts by letters, A represents an ordinary head stock of a lathe; and a, a two standards which are arts thereof. B represents the tubular live spindle which is rotatably mounted in hearings on said standards. This spindle may-be rotated by any suitable means, as, for exam lo, the cone ulley O secured thereon. e chuck for olding work is mounted in the front end of this spindle, and may be of any well known or suitable construction adapted to be 0 erated in the manner hereinafter speci red. The chuck as shown is partof a tubular collet D slit longitudinally from its front end rearward, thereby forming a plurality of s ring jaws (Z. The front or jaw end of the co et is preferably enlarged and externally t I ered, as shown, and-lies within an opposite y tapered rin G'which is screwed into the enarged en 1) of the spindle B. When the collet, whose rear end is slidably fitted within the spindle D, is moved forward the engagement of the oppositely inclined surfaces on the chuck jaws and ring G force said aws inward and cause them to grip the work. Chuck blocks (1' formed to roperly grasp the work are secured to the c uck jaws. This particular form of chuck is well known in this art. It'lendsitself admirably to use with the mechanism constituting the novel fea- ,tures of the mechanism nowto be described, for operatin it but any other form ofchuek adapted to he operated by 'saidmechanisi may be em loyed in its stead.

Within tie tubular spindle is the chuck rod E, the front end of which is screwed into the rear end of the collet. The rear end of this rod enters a cylinder F formed upon or secured to the rear end of the spindle B.

Within this cylinder is a nicely fitting piston H'to which the chuck rod is rigidly fastened. Springs I within the cylinder exert constantly a force tending to push the piston rearwardly within said cylinder, whereb the collet is drawn rearward and its jaws al owed to open.

A non-rotating coupling pipe J is rotatably fitted within an axially disposed stuffing box f on .the rear end of the cylinder F, and

through this coupling pipe and a portfin I Y the rear end of t ecylinder, compressed air or other pressure fluid ma be discharged into the rear end of said cylinder behind the piston. A'pipe M is connected to this coupling pipe J and leads therefrom to the valve casing K in which is a three-way valve is. Another pipe N leads from this valve caslng and 1s connected with a collar P which embraces.

the spindle but does not rotate with it. Within this collar 18 an annular recess 0 with which the pipe N is in free communication. In the spindle B is an opening. b which establishes communication. between the annular recess and an annular recess 1) within the spind e around the chuckrod E. A duct e in the-front end of .the chuck rod establishes communication between this annular space I) and the tubular center of the collet The operation and function of the de- After the scribed mechanism is as follows: operator has put a iece of work intov the embrace of the chuc he turns the valve is. so as to admit the ressure fluid into the cylinder F behind t 1e piston. The piston 120 machined; and then the operator turns the F05 valve It so as to' en 151p communication between the pipes fi l an N, at the same time closing communication with the source of 'the pressure fluid; Immediately the pressure fluid, which has been imprisoned in the cylinder and pipe M, is allowed to flow out of the cylinder throu h pipe M, valve casing K and pipe N into t e annular chamber p and thence into the annular space I) in the spindle, and therefrom, through duct e, into the center of the collet. As soon as the valve is turned, as stated, the springs I force the piston H rearward thereb permitting the collet jaws to open. s the ressure fluid flows into the collet, it will, if the work embraced by the chuck is of proper shape, eject the work from the device and for exhausting the pressure fluidv therefrom and conducting it to and discharging it into the rear end of the chuck.

2. In a lathe, the combination of the tubular live spindle, a chuck mounted in its front end, a fluid pressure cylinder on the rear end of the spindle, a 'piston therein, and

a chuck rod intermediate of the piston and chuck, with valve controlled means adapted to discharge pressure fluid into the cylinder behind the piston and to conduct the exhaust from said cylinder into the spindle ,in front of the cylinder,there being a duct leading from the piston to the open center ofithe chuck.

3. In a lathe, the combination of a tubular live spindle havin a fluid pressure cylinder on its rear end, a c uck mounted in the front end of said spindle, a rod connected with said chuck and extending through the spindle into the cylinder, a piston in said cylinder to which said. rod is connected, and a non-rotating coupling pipe axially mounted in the rear end of the cylinder and communicating withthe interior thereof, with a valve casing containing a three-wa valve, a pipe connecting said valve casing and coupling pipe, a non-rdtating collar embracing the spindle and containing nular recess, a pipe connecting said recess with the valve casin said spindle having a hole through its wal communicating with said recess and there being -a duct leading,

from the interior of the spindle to the open center of the chuck.

In testimony whereof, I hereunto afiix my signature in the presence of two witnesses.

- JOHN G. QLIVER.

Witnesses: 0 v E. L. TnUnsToN, H. R. SULLIVAN. 

